further improved accessibility across the application and add tooltips to action buttons

lib/view/pages/holidays/holidays_view.dart

@@ -43,6 +43,8 @@ class HolidaysView extends StatelessWidget {
               onPressed: showDisclaimer,
             ),
             PopupMenuButton<bool>(
+              tooltip:
+                  'Vergangene Ferien ${bloc.showPastHolidays() ? 'ausblenden' : 'anzeigen'}',
               initialValue: bloc.showPastHolidays(),
               icon: const Icon(Icons.history),
               itemBuilder: (context) => [true, false]
@@ -82,9 +84,7 @@ class HolidaysView extends StatelessWidget {
                 text: 'Keine Schulferien verfügbar',
               );
             }
-            return ListViewUtil.fromList<McHoliday>(
-            holidays,
-            (holiday) {
+            return ListViewUtil.fromList<McHoliday>(holidays, (holiday) {
               String holidayYear() {
                 final startYear = holiday.startDate.year;
                 final endYear = holiday.endDate.year;
@@ -94,9 +94,7 @@ class HolidaysView extends StatelessWidget {
 
               return ListTile(
                 leading: const CenteredLeading(Icon(Icons.calendar_month)),
-                title: Text(
-                  '${holiday.longName} ${holidayYear()}',
-                ),
+                title: Text('${holiday.longName} ${holidayYear()}'),
                 subtitle: Text(
                   '${holiday.startDate.formatDate()} - ${holiday.endDate.formatDate()}',
                 ),
@@ -148,8 +146,7 @@ class HolidaysView extends StatelessWidget {
                 ),
                 trailing: const Icon(Icons.arrow_right),
               );
-            },
-          );
+            });
           },
         ),
       );